William h



(No Model.)

W. H. WAKEPORD.

.ROLLER GRINDING MILL.

N0. 321,551. Patented July 7, 1885,

Unirnn STATES PATENT @rrrcn.

IVILLIAM H. YVAKEFORD, OF BALTIMORE, MARYLAND.

ROLLER GRlNDING=NlILL SPECIFICATION forming part of Letters Patent No. 321,551, dated July '7', 1885.

(No model.)

To all whom, it may concern Be it knownthat LWILLIAM H. WAKEFORD,

a citizen of the United States, residing at Baltimore, in the county of Baltimore and State of Maryland, have invented certain new and useful Improvements in Roller Grinding-Mills; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same. v

This invention relates to that style of roller grinding-mills in which the successive breaks or pairs of rollers are arranged in one and the same horizontal plane.

My invention consists of a certain combination, with the adjustable rollers, of chain-wheels and drive-chains, whereby the motion of the first adjustable roller is transmitted to the succeeding adjustable rollers. This means for transmitting motion to some of the adjustable rollers presents the same facilities for adjusting the rollers as belt-gearing, but is far superior to the latter in the respect that the speed of the adjustable rollers will remain uniform under all adjustments, because a drivechain admits practically of no slippage, whereas there is apt to be more or less slippage where a driving-belt is used, even when a belt-tightener is applied to itan adjunct not required by the drive-chain. The use of cog-gearing is more objectionable than belt-gearing, because by the adjustment of the rollers the cog-gears are apt to be thrown out of line more or less, so that they cannot run true and will soon wear out.

In order that my invention may be clearly understood, I have illustrated in the annexed drawings and will proceed to describe so much of a roller grinding-mill of the type referred to as will suffice to show the practicable application of my invention.

Figure 1 is a plan View of such a roller grinding-mill. Fig. 2 illustrates the same parts partly in end elevation and partly in crosssection on the line as a: of Fig. I.

The same letters of reference indicate identical parts in both the figures.

I have shown a mill having three breaks or pairs of grinding-rollers, of which the nonadjustable rollers A, B, and C are all secured to a single shaft, D, the pulley D on one end of which is driven by the belt from pulley E on the corresponding end of the countershaft E of the mill. A pulley, E on the op posite end of the counter-shaft drives, by cross-belt, the pulley C fixed on one end of the shaft 0 of the adjustable roller 0. To the other end of the shaft 0 of the adj ustable roller Ca chain-wheel, 0*, is secured. Ghain-wheel 0" drives a chain-wheel, F, by means of the drive-chain F. Chain-wheel F is constructed with two sets of sprockets-one for the drivechain F and the other for the drive-chain G by which the motion of the chain-wheel F is transmitted to a chain-wheel, B on one end of the shaft 13' of the adjustable roller B. The shaft of adjustable roller B transmits motion to the adjustable roller A by means of the chain-wheel B, drive-chain H, sprocketwheel H, drive-chain I, chain-wheel A, and rollershaft A I have shown the sprocketwheels F and H as journaled in bearings on top of the main frame of the mill; but it is obvious that the location of these chain-wheels may be changed to suit circumstances or the views of the builders.

I have shown screws for sliding the bearings of the adjustable rollers to effect the adj ustment of thelatter; but any other known means for adjusting the adjustable rollers of roller grindingmills may be employed. The ordinary slack in the drive-chains is so little varied by the slight adjustments of the adj ustable rollers as not to affect the driving action of such drivechains.

I claim as my invention- In aroller grinding-mill the breaks of which are arranged in one and the same horizontal plane, the combination, substantially as before set forth, with the adjustable roiler of one break and the adjustable roller of the next succeeding break, of the chaiawheels and drivechains for transmitting the motion of one adj ustable roller to the other adjustable roller. In. testimony whereof I affix my signature in presence of two witnesses.

WV. H. YVAKEFORD. Witnesses:

G. A. NEALE, E. T. VALKER, 

